Jig



JIG

Filed April 2'7, 1936 2 Sheets-Sheet 1 F 5 INI'ENTORL 7' JOSEPH SPECKER ATTORNEY.

Dec. 20,1938.

J. s. PECKER 2,140,762 7 JIG Filed April 27, 1936 2 Sheets-Sheet 2 INVENTOR. I

' JOSEPH s. PECKER ATTORNEY.

Patented Dec. 20, 1938 UNITED STATES PATENT OFFICE 8 Claims.

My invention relates to a jig of the general type disclosed in my prior Patent No. 1,897,495 of February 14, 1933, andit relates more particularly to an improved form of jig in which the clamping of the work-piece may be effected. manually, or by power means, and in which a plurality of work-pieces, or a single, relatively large workpiece may be clamped easily, effectively and in a self-locking manner.

My invention still further relates to a jig of this general character embodying novel features of construction which permit the clamping of a piece of work, with minimum or no interference, by the parts of the jig itself, that is, a jig embodying a novel open structure in which the space between the clamp-plate and the drillplate is accessible from at least three directions without any obstruction.

My invention still further relates to a jig of the character described in which the moving parts are provided with specially designed bearing surfaces to aiford maximum strength and maximum accuracy in supporting the work-piece in position.

Other novel features of'construction and advantage will be more clearly apparent from the following specification and the accompanying drawings, in which:

Fig. 1 represents a View partly in elevation and partly in section showing a jig embodying my invention.

Fig. 2 represents a view, partly in section partly in plan, on line 2-2 of Fig. 1.

Fig. 3 represents a section on line 3-3 of Fig. 2.

Fig. 4 represents a right-hand end elevation of Fig. 1.

Fig. 5 represents a view, similar to Fig. 1, of another form of construction.

Fig. 6 represents a View, partly in plan and partly in section, on line 6-6 of Fig. 5.

Fig. 7 represents a section on line 1-1 of Fig. 6.

Fig. 8 represents a left-hand end elevation of Fig. 6.

In Figs. 1 to 4 I show one form of construction in which I utilize a base, platform, or casting 36 on which is mounted the vertical bracket 3| which in turn supports the drill-plate construction 32. In this construction it will be noted that the drill-plate 32 over-hangs the working part of the jig so that the latter is unobstructed in its approach and is accessible from all directions except where the supporting bracket 3| is positioned, thereby enabling me to clamp any desired workpiece regardless of its extensions, its size, its shape, or the assembly to which it may be conand nected. In this construction, I utilize two or more cam elements, generally designated as A and B, which. in their specific construction, are of the type disclosed in my prior patent aforesaid, and particularly Fig. 4 thereof, said cam elements A and B being connected in tandem to the operating arm 33 to which is fulcrumed at 34 the actuating lever 35 so that, by the movement of the actuating lever 35, the two or more cam elements A and B are moved, simultaneously, to raise or lower the single work-table 36, common to all of the cam elements A, B. etc., and which supports the work-piece 6 and clamps it against the drill-plate 32. 31 designates bearings for the lower and upper halves of the operating cams A and B, and 38 designates guide or bearing posts mounted on the base 30 and serving to guide or afford bearing for the worktable 36. It will be seen from Figs. 1 and 4 that the guide or bearing posts 38 do not extend all the way up to the drill-plate 32 but, on the other hand, are normally about flush with the top of the work-table 36 when the latter is in its lower-most position so that the guideposts 38, while affording adequate bearing for the work-table 36 in its upward and downward movements, are, nevertheless, out of the way and do not obstruct the space between the work-table and drill-plate to leave said space completely accessible for insertion of the work-piece 6 from any direction.

In Figs. 5 to 8, inclusive, I have shown still another form of construction in which I utilize the base 40 on which is mounted a bracket 4| which supports the over-hanging drill-plate 42 in substantially the same manner as shown in Figs. 1 to 4. In this modified form of construction I also utilize two or more cam-units A and B which serve to raise and lower a single work-table 44 which carries the work-piece 6 to be clamped between the work-table 44 and the drill-plate 42. In lieu of connecting the plurality of cam-units A, B, etc., in tandem, as shown in Figs. 1 to 4, I provide each of said units with a gear segment 45, and I so mount the units as to mesh their contiguous gear segments together as best seen in Fig. 6. By moving the actuating arm 46 in either direction, the cam-unit to which the actuating arm is connected is turned, and by meshing with the next adjacent unit is turned also so that simultaneous actuation of all of the cam-units used is accomplished. In this construction I also utilize the brackets 41 which are mounted on the base 40 and fastened by the bolt 48 to aiford the necessary bearing for the pendent-skirt 50 of the worktable 44 while the cam-units A and B are provided with the bearings 49 which may be integral with, or secured to, the base 40 as best seen in Fig. 5.

The pendent skirts 50, which, in addition to aflording bearings when they coact with the bearing-brackets 47 (see Fig. 5) also serve to guard the snugly fitting parts from ingress of chips or other foreign substance. Also, the operating levers 35 and 46 can be secured to a particular cam-unit A or B to which they are attached by any suitable means 5|. It will be noted that the upper and lower halves of the cam-units are bottomless so that the chips resulting from the operation of the drills 23, or other tool through the holes 24, are permitted to fall through. If desired, suitable form of power coacting means, such as that best shown diagrammatically in Fig. 2, may be applied to the construction shown in Figs. 6 to 8.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A jig comprising, a base structure, a plurality of upper and lower cylindrical co-acting cam-units, said cam units having inclined abutting end surfaces a work-table carried by said upper cam-units and adapted to support a workpiece, and a single actuating device common to said lower cam-units for simultaneously operating the latter to raise or lower said upper camunits and said work-table.

2. A jig comprising, a base structure, a plurality of upper and lower cylindrical co-acting cam-units, said cam units having inclined abutting end surfaces a work-table carried by said upper cam-units and adapted to support a workpiece, a single actuating device common to said lower cam-units for simultaneously operating the latter to raise or lower said upper cam-units and said work-table, a support at one end of said base structure and a plate carried by said support and over-hanging said work-table.

3. A jig comprising, a base structure, a plurality of upper and lower cylindrical co-acting cam-units, said cam units having inclined abutting end surfaces a work-table carried by said upper cam-units and adapted to support a workpiece, a single actuating device common to said lower cam-units for simultaneously operating the latter to raise or lower said upper cam-units and said work-table, and bearings for said worktable carried by said base structure, said bearings being substantially flush with the top of said work-table when the latter is in its lowermost position.

4. A jig comprising, a base structure, a plurality of upper and lower cylindrical co-acting cam-units, said cam units having inclined abutting end surfaces a work-table carried by said upper cam-units and adapted to support a workpiece an actuating lever operatively associated with at least one of said cam units, and a single power actuated device for operating said lever for simultaneously operating the latter to raise or lower said upper cam-units and said worktable.

5. A jig comprising a base, contiguous rotary cams on said base, gear elements on the contiguous portions of said cam units for meshing one with the other, and an actuating lever operatively connected to one of said cam units, whereby the turning of one of said cam units also turns the contiguous cam unit.

6. A jig comprising a base, lower, contiguous, rotary cams on said base, gear elements on the contiguous portions of said cam units for meshing one with the other, an actuating lever operatively connected to one of said cam units, whereby the turning of one of said cam units also turns the contiguous cam unit, upper cam units resting on said lower cam units, and a work table carried by said upper cam units and adapted to be raised and lowered with the rotation of said lower cam units.

7. A jig comprising a. base, lower rotary cam units on said base, a bell-crank mechanism operatively connecting said lower cam units, upper cam units resting on said lower cam units, a work table supported by said upper cam units and an actuating lever connected to said bell-crank mechanism for rotating said lower cam units to raise and lower said Work table.

8. A jig comprising a base, cam units rotatably mounted on said base, a bell-crank mechanism interconnecting said cam units and an actuating lever for operating said bell-crank mechanism.

JOSEPH S. PECKER. 

